Release 3.4.0.0.0: Stacks 3.4 Hard Fork

[Jesse Wiley]

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Hello,

Stacks core developers have released Stacks Core version 3.4.0.0.0, available here: https://github.com/stacks-network/stacks-core/releases/tag/3.4.0.0.0.


This release implements the 3.4 Stacks consensus rules which activates at Bitcoin block `943,333`.
For more details see the following SIPS:
SIP-039: Clarity 5 and Epoch 3.4
SIP-040: SIP for improved post-conditions
SIP-042: Removal of at-block

**This is a required upgrade**
* Activation is estimated for April 2, 2026 around 2000 UTC, or Bitcoin block 943,333.
* Upgrading after Bitcoin block 943,333 **will require** a genesis sync.


This release is compatible with chainstate directories from 3.3.x.x.x.

The version of stacks-signer compatible with this release is 3.4.0.0.0.0, available at: https://github.com/stacks-network/stacks-core/releases/tag/signer-3.4.0.0.0.0.


### Added

* Set the epoch 3.4 activation height to 943,333 per SIP-039 and finalize all settings for epoch 3.4 and Clarity version 5.
* Added post-condition enhancements for epoch 3.4 (SIP-040): `Originator` post-condition mode (`0x03`) and NFT `MAY SEND` condition code (`0x12`), including serialization support and epoch-gated validation/enforcement.
* Disabled `at-block` starting from Epoch 3.4 (see SIP-042). New contracts referencing `at-block` are rejected during static analysis. Existing contracts that invoke it will fail at runtime with an `AtBlockUnavailable` error.

### Changed

* `/v3/blocks/simulate/{block_id}` and `/v3/block/replay ` no longer emit transaction events for post condition aborted transactions.
* `EventDispatcher` no longer emits transaction events for post condition aborted transactions.

### Fixed
* Fixed signer database migration 19 that could leave the database in corrupted, unrecoverable state.


************************************************************************************************************************************************************************************
Stacks Core:

Git commit hash: b041055910fc80846ca2eef379a4a22cd80ca3c6

SHA512SUMS:
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************************************************************************************************************************************************************************************

Stacks Signer:

Git commit hash: b041055910fc80846ca2eef379a4a22cd80ca3c6

SHA512SUMS:
513de863e046ca879d231a7a14135008bb0118f658c53f1296cd78af2218d482fcbcf034ed266ee8a231454da5cb9ee6266eb04f555afcb4f08dc2465d4a4964  linux-glibc-arm64.zip
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0dd1a7f746d3700ff495a4870cd3b5d4a31a395eaeba7c71e8f0bc9f50f851093214b20e6102a483153c4420de694197ae235c6285b542258166a0db514f1f50  macos-arm64.zip
17b99bff347ccba455ac546b8eb799c61996c143035e135f56ab698e74bd62ab6da73989b93b36386dd5aa2624699e7b56792dc4220373e186ce6f2fb54ef64d  windows-x64.zip




Best,
Jesse Wiley
Engineering Partner, Stacks Foundation
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